FBA as always top! The product, well packaged, only consists of a thin silicon layer, etc. which one lays on the keyboard without adhesive surface. Some characters are not exactly congruent, but this does not necessarily bother me. Typing is thus just as easily as before. Also it is easy to slip on and the space bar, the name of the company. All in all, it fulfills the purpose of crumbs so have no chance. It is not 100pro protect because they do not exactly closes against liquid. For durability, I can not say anything yet.